I have a a 17" 1.83 Intel iMac, and I just bought a new 400 GB drive for it. I've heard it can be rather tricky to install those. Does anyone have a good guide that would show me whether I could handle it? I've installed a new drive in an old powerbook, a Mac Mini, and thrown RAM in everything under the sun, so I'm not a complete idiot when it comes to these things, but I'm no computer tech either. Should I even attempt this, or just take it to the Apple store?